Hi,
I finally discovered that my video card only supports 2.1 through HDMI/DVI. You need a true HDMI port on you video card to output more channels. I found that the DVI port will only pass 2.1 channels of analog audio as well, same issue as the first sentence. It would have been simple to put this capability on such a high end card (at the time) because the technology and the support was there. Oh well.
Thanks everybody,